Conductor for mine explosives



R. L. BOWMAN.

CONDUCTOR FOR MINE EXPLOSIVES.

APPUCATION FILED JAN. 19, 1921.

1,395,79 1. Patented Nov. 1, 1921.

"UNITE STATES Application filed January 19,1921. f'si ai K543814161" ful Conductor for Mine Explosives, of which a the following is a specification.

This invention :relates to a vconductor for use by coal minersand the, like for the purposeof 'directingexplosive charges back into the holes that are drilled prior to the blasting operations. Heretofore it has been the practice to deposit the powder by xforcing back into the holes shells." of paper or;

similar material containing the explosive charges. The method, which'is 'used at the present time has been found objectionablebecause it has been adiflicult matterto prop erly insert 'a paper shell intothe'drilled hole without causing it to become distorted before the powder is brought to the inner end of the hole and, consequently, the charges I having been improperly placed,.the result of the blasts has not been up to the requirements for insuring maximum efiiciency; 3 1

One of the objects of the inventionli's'to obviate the objections heretofore present and} which have been pointed out by providing a conductor in the form of a container "or holder in which the filled shell ofpr operlength is placed, said conductor" with; its contents being insertiblelinto the hole that has been drilled so as to'bring the'contents 3 insuring the desired result when'the' charge 7 is explodedf 1 '3 shell.

4 A still further readily adjusted.

of the'conductor at the innermost end of thehole'if desired it being possible then to withdraw the conductor so as to'leav'e the] explosive charge intact within the'hole, thus which .canbe used for placingeither ajloadedshell or a char parts of fwhich can be ge I of explosive without the:

PATENT- OFFICE."

ROBERT LEE BOWMAN, 0F noxvILLEQrENnnssEE.

' oonnuo'ron ronivmvn ExrLosrvEsL Specificationot Iletters Patent; 'Patented N V 1 1921 v Another objectis to provide a conductor."

behutil zed as an adjustable man drel wherebywpaper shells can be formed of which can the proper-size for use and loaded separate fr mwor'm the conductor. I

rwah the foregoing andlother objects in view Wl'llCliWlll appear as. the description proceeds, the'finvention resides inthe comblIliLtlOIhflIld arrangementfjofparts and in the detailsjof construction hereinafter describedl'andf claimed, it being understood '1 use within thescope of what is claimed, I

changes in the precise embodiment of theinvention shownlcan be' made withoutfdepartin fromthe'jsp irit of the invention. e accompanying drawings the 'prefln t ferred form shown, V

In said drawings- 1 0f the-invention has been and partly Fig; 2 is a section on line 2-2, Fig

ifs a section on'-line3'ir3,.Fig.'.l.,-' 1g, t is a perspective view; of" comi b ned' cup and closure to be used-with the Q i I conductor Figure l is a-vl ew. partl e1eVatiOn I ms l'ofa condu'ctorembody m the p e im rovemem I f sitely' disfpose'd trough shaped section 3'likewisefclosed'at,oneend as indicatedatf lt; =A central opening- 5 is formedflin the endow-all Qand registers with a slot 6 extendingintothe. end wall 4E-Qfrbm the freeend thereof this opening 5 and. slotf6 being" designed to receive t'he tubulanst'emf 71 0f i the follower 8. i fadaptedjtoslide within'the two sections l objectisto provide a con-f ductor which can be adjusted readily for in}; sertion into. holes of different depths and' different diametersfand to: accommodate ex- Y plosive charges ofdifierent proportional Another object is'to "provlcle'j ,conductor' within the sections 1 and '3.

stem 10 (is extended through V i and 31 A knobis detachabl'y connected to, the outer. end 1 of the 1 stem E7 by me ns 1 v thereof the plunger or followerti canqbegsli'd portion of the section 1 andthe topporti'on of th ses- 1 1113, 'andhas threads extendin oppositely to the threads on the otherhalf when turned in one direction will cause the section 3 to move into the 'section l while, when turned in'the other directionthe said section 3 can be removed from the section 1 and swung about the stern 10.- Trough-like extensions 12 can be telescopically connected to each other andtojthe section-l 'so as to permit the use of a trough member of any desired length. Extensions 13 "telescoping" into each other and into the section 3 can also be provided and thus it will be seen that the container can be adjusted to any desired 7 length so as to correspond with the depth of a hole in which the explosive is to be-placed. Likewise by rotating the stem 10 the-sec tions 1 and'3 and the extensions connected able means such'as bayonet slots. 14 and lugs- 15 being employed for holding the stemsections properly assembled when extended and rotated, as will be obvious. The removable, knob 9 can; if desired, be connected to the end" of a rod insertible into the tubular stem 7 and which has been shown at 16, this rod when removed being useful as a ram rod for tamping'material within the conductor.

' I as hereinafter explained.

A fuse openingl? is formed in theiwall 2 anda slot 18 extends into the follower or plunger 8 adjacent one of'its ends. 7

If desired a graduated cup such asshown' at 19 may be; employed'as'acap oriclosure for the open end ofthe conductor whenthe same is not in use and. can also be used as a measure for handling" the explosive. placed in the conductor. I In using the device herein described the. same; is first adjusted to the 'lengthjof the hole in which the explosive charge-is to. be: placed. The stein 1O isthen turn'ed so as to move the section 3 and its extensions out of the section 1 and its extensions. The said section 3, and the parts carried thereby are then swung laterally out of position'over the section 1. and its extensions. The fol lower or plunger S is .then pulled-back against the closedend offthes'ection l, a fuse is inserted through theo'peningl'? and through the slot 18, and a wad may be placed; against the follower or plunger 8. If a; paper shell is to be used the same isplaced in the section 1 or its extensions and .is then "filled with the explosive. After the parts."

have thus been placed the section 3 and its extensions are swung around to position above the section -1'an'd its i extensions. wBy

then rotatingthe stem 10 the opposed sec i tions are drawn together so as to clam tightly upon the contents 'of. the follower the contents-of the'conductor. The operator holdsthe stem .7 so as to prevent the plunger or follower 8from movlng and while iteis thus held l e-withdraws the conductor; from the hole and from around the explosive charge, leaving saidcharge within the hole and properly positioned in the desired portion thereof. The charge is then tamped as ordinarily, the fuse bein'gf-left in-thehole and it will be found that ingevery instance the maximiunresult will be obtained 7 by placing acha-rge with the aid of a conductor such;

as described- The loss of life, property, ma

terial, time and-labor .resulting'fromthe placing of a chargein the old way is entirely elirmn'ated.v *While' a. paper shell of the;

usual or any. preferred type can be usedinthe conductor it is ;to be understoodfthat a" charge ofexplosive material in loose form: r

can be. poured into the conductor andr -held therein by -wads and; then inserted into the;

hole, asheretofore described. Also, if 'dej-,

sired, a paper. shell can be formed byfwrap3 ping paper 'abouttheconductor, theisaid V conductorbeing employed as amandr'el. The; shell can then be placed inside of; the con-,

duct'or andlfilledin' the mannerhereinbefore .4.

pointed out; j

By providing the "slot 18 a is. passing] readily to disconnect the follower or plunger 8 from the fuse immediately after withdrawing the conductor. This is deneby-givi-ng a} slight rotation to the follo wer or plunger 8 suflieient to causejithe slotted port-ion tomove out of engagement withthe fuse- Whatis claimed is :f

1 l.-"A"'device of thefoclassdescribed includ ing achargeholding' portion adjustable in transverse area,. andlan slidablejwithin, said portion. 7 I

2. A device of theclass describedinclud inga charge holdingportion closed at one ej ing. plu gerend and adjustablein transverse area, and? an ejecting plunger slidable therein. 1

3. Afdevice oftheclass,desoribed-incluthi ing a charge holding portion adjustablei 1 transversely and longitudinally todifferent areas, and. an ejecting plunger movable;

therein;

' 4. A drea the cns'a seut'ea aid ing opposed, separable sections constituting charge holdingmeansand an ejectingplun ceiving I I j oneof sald sections;

ger slidable therein; there being} fuse rewpenlng in the plunger and in 1 the;

p v 5. A device of the class describedincluding telescopicallyconnected seotions,;;means for adjusting them toward and;from gegaolr;

other to vary the transverse area therebetween, and an ejecting piston movable be tween the sections.

6. A device of the class described including cooperating members constituting a transversely adjustable mandrel for shapq ing a shell and constituting .a transversely adjustableconducto'r for subsequently holding the shaped shell for insertion into acavity. 7 v

In testimony that I clalm the foregoing as my own, I have hereto aflixe'dmy signature I in the presence of a Witness.

ROBERT LEE BOWMAN.

Witness:

IVY E. ,SIMPsoN. 

